Problem with GWT+Hibernate

hi folks,, 
i have a problem with integration of gwt & hibernate,,, 
when i use RPC without Hibernate & dataObj Movement over the network..it's work(for Object Like Inreger,String),, 
but when i add the hibernate to the project & want to move a myOwn Class Object over the net to the server for Saving it to the DB,,it's make a error,, 
this is my Error: 

ERROR: Unable to find type 'com.mySampleApplication.client.MySampleApplication' 
ERROR: Hint: Previous compiler errors may have made this type unavailable 
ERROR: Hint: Check the inheritance chain from your module; it may not be inheriting a required module or a module may not be adding its source path entries properly 
ERROR: Failed to load module 'MySampleApplication' from user agent 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/28.0.1500.71 Chrome/28.0.1500.71 Safari/537.36' at localhost:49745 

this is Structure of My Project,,: 

https://www.dropbox.com/s/tgcpz8luyivcgxt/gwt%2Bhibernate.png 

this is my gwt Configuration File: 

1. <!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.0//EN"  
2.         "http://google-web-toolkit.googlecode.com/svn/releases/2.0/distro-source/core/src/gwt-module.dtd">  
3. <module rename-to="MySampleApplication">  
4.   
5.     <!-- Inherit the core Web Toolkit stuff.                  -->  
6.     <inherits name='com.google.gwt.user.User'/>  
7.   
8.     <!-- Specify the app entry point class.                   -->  
9.     <entry-point class='com.mySampleApplication.client.MySampleApplication'/>  
10.   
11.     <source path="com.mySampleApplication.client"/>  
12.   
13.     <!-- Specify the app servlets.                   -->  
14.     <servlet path='/MySampleApplicationService' class='com.mySampleApplication.server.MySampleApplicationServiceImpl'/>  
15.   
16. </module>  

I have Entity CLass With name Student : 

1. @Entity  
2. @Table(name="STUDENT")  
3. public class Student implements Serializable{  
4.   
5.     @Id  
6.     @GeneratedValue  
7.     Integer id;  
8.     @Column  
9.     String name;  
10.     @Column  
11.     String family;  
12. //setter & getter  
13. //constructor with 2 Argument,,& no Argument  
14. } 

i Have Student Manager: 

1. public class StudentManage{  
2. private static SessionFactory factory;  
3.     public StudentManage()  
4.     {  
5.         try{  
6.   
7.             factory = new AnnotationConfiguration().  
8.                     addAnnotatedClass(Student.class).  
9.                     configure("hibernate.cfg.gwt.xml").buildSessionFactory();  
10.   
11.         }catch (Throwable ex) {  
12.             System.err.println("Failed to create sessionFactory object." + ex);  
13.             throw new ExceptionInInitializerError(ex);  
14.         }  
15.     }  
16.   
17.     public void save(Student stu)throws Exception  
18.     {  
19.         Session session = factory.openSession();  
20.         Transaction tx=session.beginTransaction();  
21.         session.saveOrUpdate(stu);  
22.         tx.commit();  
23.         session.close();  
24.     }  
25. }  

this is implementation of My Service in the Server : 

1. public class MySampleApplicationServiceImpl extends RemoteServiceServlet implements MySampleApplicationService {  
2. @Override  
3.     public String setStu(Student stu) {  
4.   
5.         //System.out.println("In the set");  
6.         StudentManage studentManage=new StudentManage();  
7.   
8.         try {  
9.             studentManage.save(stu);  
10.         } catch (Exception e) {  
11.             e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.  
12.         }  
13.         return "Data Saved in DB";  
14.     }  
15. }  

And this is my own Code for the Client Side to send the Object to the Server,, 

1. public void onModuleLoad() {  
2. button.addClickHandler(new ClickHandler() {  
3.             @Override  
4.             public void onClick(ClickEvent event) {  
5.                 System.out.println("int the ClickEvent");  
6.                 MySampleApplicationService.App.getInstance().setStu(stu, new AsyncCallback<String>() {  
7.   
8.                     @Override  
9.                     public void onFailure(Throwable caught) {  
10.                         Window.alert("Error");  
11.   
12.                     }  
13.   
14.                     @Override  
15.                     public void onSuccess(String result) {  
16.                         Window.alert("Data is in the DB..." + result);  
17.                     }  
18.                 });  
19.             }  
20.         });  
21. }  

i'm wating for your Solutions,,

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